CN201430212Y - a dipole antenna - Google Patents

Abstract

The utility model provides a dipole antenna, which comprises a dielectric chassis, two dipole arms and a feed connector, the two dipole arms are elliptical; and the two dipole arms are attached to on the same side surface of the dielectric chassis and connected through the feed connector. The two elliptical dipole arms are of the same size, with a major axis of 80mm and a minor axis of 60mm. The medium chassis is circular with a diameter of 136mm and a thickness of 1.6mm. The media chassis is made of epoxy resin. The feed connector is an SMA connector. The elliptical dipole antenna of the utility model has ultra-broadband performance, and its working frequency band covers all frequency ranges in the current mobile communication field. , The advantage of being easy to process and manufacture, so it can be widely used in wireless mobile communication systems, especially suitable for small and portable mobile communication systems.

Description

a dipole antenna

technical field

The utility model relates to the field of wireless communication, in particular to a dipole antenna.

Background technique

In recent years, ultra-wideband short-range wireless communication has attracted great attention in the field of global communication technology. Ultra-wideband communication technology has become one of the most competitive and promising technologies for short-distance wireless communication due to its high transmission rate, strong anti-multipath interference ability, and high confidentiality. In UWB communication system, UWB antenna is one of the key components. Some commonly used ultra-wideband antenna structures, such as traveling wave antennas, logarithmic periodic antennas, equiangular helical antennas, horn antennas, etc., these antennas can achieve several octave operating frequency bands, but they all have a common shortcoming, That is, the geometric size is large, and most of them are three-dimensional structures, which cannot meet the needs of miniaturized and planar antennas in portable wireless mobile communication systems.

Dipole antenna is the most basic antenna form at present. It has omnidirectional radiation characteristics, its structure is simple, and its cost is low. It is widely used in various wireless communication systems. However, the frequency band of ordinary dipole antennas is very narrow (about 1%-5%). Some new dipole antennas, such as biconical antennas and double dipole antennas, have significantly expanded bandwidth, but their operating frequency bands Most of them are above 3GHz, which is not suitable for the commonly used mobile communication frequency band (800MHz～3GHz), and the structure is relatively complicated, mostly three-dimensional structure, which is still not suitable for portable wireless mobile communication systems.

Utility model content

In order to avoid the above problems, the utility model provides an ultra-wideband dipole antenna whose working frequency band can cover all current mobile communication frequency bands, and has a simple structure and excellent performance.

The technical scheme that the utility model solves its technical problem adopts is:

A dipole antenna, comprising a dielectric chassis, two dipole arms and a feed connector, the two dipole arms being elliptical;

Moreover, the two dipole arms are attached to the same side surface of the dielectric chassis and connected through the feed connector.

Preferably, the two elliptical dipole arms are of the same size.

Preferably, the major axis of the two elliptical dipole arms is 80 mm, and the minor axis is 60 mm.

Preferably, the media chassis is circular.

Preferably, the circular media chassis has a diameter of 136mm and a thickness of 1.6mm.

Preferably, the media chassis is made of epoxy resin.

Preferably, the feed connector is an SMA connector.

The elliptical dipole antenna of the utility model has relatively large bandwidth and ultra-wideband performance, and its working frequency band covers all frequency ranges in the current mobile communication field, and is especially suitable for the commonly used mobile communication frequency band range of 800MHz-3GHz. In addition, the elliptical dipole antenna of the utility model is a planar antenna, and its diameter is only 136mm. In wireless mobile communication systems, it is especially suitable for small and portable mobile communication systems.

Description of drawings

Fig. 1 is a structural schematic diagram of a dipole antenna of the present invention.

Fig. 2 is a structural schematic diagram of the feeding connector of the dipole antenna of the present invention.

Fig. 3 is a simulation and test data diagram of the elliptical dipole antenna S11 of the present invention.

Fig. 4 is a simulation data diagram of voltage standing wave ratio of the elliptical dipole antenna of the present invention.

Detailed ways

The purpose of the utility model is to provide an ultra-wideband planar dipole antenna whose working frequency band can cover all current mobile communication frequency bands and has a simple structure.

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings and examples.

Fig. 1 is a structural schematic diagram of a dipole antenna of the present invention. As shown in Figure 1, the dipole antenna of the present utility model is planar structure, comprises dielectric chassis 2, two dipole arms 1A, 1B and feed joint 3, wherein, two dipole arms 1A, 1B shape They are all elliptical, and are attached to the same surface of the dielectric chassis 2. The feed joint 3 is connected to the two dipole arms 1A, 1B.

The dielectric chassis 2 is used to support the two dipole arms 1A, 1B and the feed joint 3, which can be manufactured as a circle with a diameter of 136 mm and a thickness of 1.6 mm, which is made of epoxy resin with a dielectric constant of 4.4 . This material is mostly used to make single-sided circuit boards and planar antennas, which are relatively common and inexpensive.

In order to make the dipole antenna of the present invention applicable to the commonly used mobile communication frequency band of 800MHz-3GHz, its resonant frequency band is designed to be 800MHz-6.0GHz, namely, f ₁ =0.8GHz, f ₂ =6.0GHz. When the length of the antenna is 1/2 of the wavelength of the radio signal, the transmission and reception conversion efficiency of the antenna is the highest, wherein the length of the antenna is the sum of the lengths of the two elliptical arms, then when the length of the elliptical arm is 1 of the wavelength of the radio signal When /4, the transmission and reception conversion efficiency of the antenna is the highest. Therefore, the length of the antenna will be determined according to the frequency or wavelength of the transmitted and received signals. According to the formula (1) and formula (2) for calculating the size of the elliptical arm, it can be concluded that the minor axis length of the single elliptical arm of the dipole antenna of the present invention is 60 mm, and the major axis length is 80 mm. When the working frequency band of the dipole antenna needs to be adjusted according to the actual situation, it can be adjusted accordingly by adjusting the long and short axis dimensions of the elliptical arm according to formula (1) and formula (2).

$\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; c</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

The two dipole arms 1A, 1B are connected by a feed connection 3 as shown in FIG. 2 . The inner core 31 of the feed connector 3 is a signal line, and the surrounding four pins 32 are all ground pins. The dipole arm 1A is connected to the inner core 31 , and the other dipole arm 1B is connected to one of the pins 32 .

The distance between the two dipole arms 1A, 1B is determined by the distance between the inner core 31 of the feed connector 3 and the ground pin 32 . In this embodiment, the feed connector 3 is an SMA connector, and the distance between the two dipole arms 1A, 1B is 1.5mm. The dipole antenna is connected to the coaxial cable through the feed joint 3, and the function of the feed joint 3 is to match the impedance of the antenna feed point with the coaxial cable. Usually, the impedance of the coaxial cable is 50Ω, therefore, the input impedance of the feed connector 3 is also 50Ω.

Fig. 3 is a simulation and test data diagram of the elliptical dipole antenna S11 of the present invention, wherein the solid line in the figure represents the simulation data, and the dotted line represents the test data. As can be seen from Figure 3, the -10dB bandwidth of the elliptical dipole antenna of the present invention can cover 800MHz～6.0GHz, covering all frequency ranges in the current mobile communication field, and is especially suitable for the commonly used mobile communication frequency bands of 800MHz～3GHz Range; its relative bandwidth is about 5.2GHz (76.5%), which belongs to ultra-wideband antenna.

Fig. 4 is a simulation data diagram of voltage standing wave ratio (VSWR) of the elliptical dipole antenna of the present invention. As shown in Fig. 4, within the working frequency range of 800MHz-6.0GHz, the voltage standing wave ratio VSWR of the elliptical dipole antenna of the present invention is less than 2, which can well receive small signals in free space.

The elliptical dipole antenna of the utility model has relatively large bandwidth and ultra-wideband performance, and its working frequency band covers all frequency ranges in the current mobile communication field, and is especially suitable for the commonly used mobile communication frequency band range of 800MHz-3GHz. In addition, the elliptical dipole antenna of the utility model is a planar antenna, and its diameter is only 136mm. In wireless mobile communication systems, it is especially suitable for small and portable mobile communication systems. For example, it can be used as a test antenna in a mobile terminal electromagnetic compatibility (EMC) test system, which can detect small signal.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any skilled person who is familiar with the profession, without departing from the scope of the technical solution of the utility model, can use the above disclosure The technical content of the utility model is slightly changed or modified into an equivalent embodiment of an equivalent change, but any simple modification, equivalent change and Modifications still belong to the scope of the technical solution of the utility model.

Claims (7)

1, a kind of dipole antenna comprises medium chassis, two dipole arm and feed connection,

It is characterized in that,

Described two dipole arm are oval;

And described two dipole arm are attached at the same side surface on medium chassis, also continuous by described feed connection.

2, dipole antenna as claimed in claim 1 is characterized in that, two oval dipole arm sizes are consistent.

3, dipole antenna as claimed in claim 2 is characterized in that, the major axis of two oval dipole arm is 80mm, and minor axis is 60mm.

4, dipole antenna as claimed in claim 1 is characterized in that, described medium chassis is circular.

5, dipole antenna as claimed in claim 4 is characterized in that, the diameter on circular medium chassis is 136mm, and thickness is 1.6mm.

As claim 1,4 or 5 described dipole antennas, it is characterized in that 6, described medium chassis is made by epoxy resin.

7, dipole antenna as claimed in claim 1 is characterized in that, described feed connection is a sub-miniature A connector.

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